Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acc657e6bee4e3b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 00:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f89f2be679f5932e31bd13aa465ea847 SHA-1: 20b099ac87840835aa365d4c060b081d2855c615 SHA-256: 5acc657e6bee4e3b2be1bf56e801204bb6c1c95a720015cd58fcd2cd6288b863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=cyberflix+tv+watch+online
    • http://hsi-international.com/ckfinder/userfiles/files/42701096704.pdf
    • http://sutipatika.hu/userfiles/files/nojupiwoxofik.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613471b2584b8---59298782808.pdf
    • http://dar-tom.pl/userfiles/file/87333362800.pdf
    • http://metallpress.ru/files/favarokuburugu.pdf
    • https://moiatakashta.com/userfiles/file/72933406430.pdf
    • https://duongthuy.net/userfiles/file/94303031393.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8330215f41febae96bfdb59909f45203/digatoxizojubodopirupugen.pdf
    • http://bpabv.nl/uploadfiles/file/8479747352.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nelopozilezu.pdf
    • http://chokmanee.com/userfiles/file/jefaz.pdf
    • http://lnv-cnc.com/userfiles/file/97524344203.pdf
    • http://nscenter.cn/upload/files/29453112932.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b1b1347a---96995618874.pdf
    • http://kaithompson.com/userfiles/file/jaguwuk.pdf
    • http://apvn.info/userfiles/file/3866794452.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/57962433568.pdf
    • https://mauspro.net/upload/files/papaxafifemaguxiwaju.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/xezevimogivimuvimago.pdf
    • http://www.bash.cl/media/file/pepaluniwirubebokotalir.pdf
    • http://tavaszitura.eu/userfiles/files/levejotoneboloja.pdf
    • http://dentistturkey.com/image/files/xoxutigore.pdf
    • http://xn--80aamwn.xn--p1ai/userfiles/file/rakivobixowujog.pdf
    • http://paneldeconsos.com/userfiles/file/xafujafadaravazazebe.pdf
    • http://gdgom.com/upload/file/210907232453510935d685niduxv5g.pdf
    • https://anfauglir.com/images/file/58806175152.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes
font_01_sfnt_off00010cc7.bin
a0307923d2fc83e6172e2eee58a827e2019c3838b674e1ddecb56d8205055faa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 10804 bytes
font_02_sfnt_off000125b8.bin
3b4589c0dbea39a1b02c2830dd99dc760c10e6b108496fb0434d452c8772cf29
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 19944 bytes